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Ice-Covered Lake On Mars?

The Mars Global Surveyor snapped an intriguing photo while orbiting over latitude 24.65°, longitude 207.10°. It looks like a lake! There even seem to be
reflections of the surrounding terrain. But, as T. Van Flandern comments, this glassy-looking area cannot be liquid water because the vapor pressure is too
low on Mars -- water would quickly evaporate away. Ice, however, is a strong possibility.

Comments. The reference did not specify the Martian hemisphere, but it was probably the northern, where there are extensive lowlands. In fact, if water once
did flow on Mars, 75% of it would have drained into these lowlands. (Anonymous; "Mars in 3-D," Science News, 156:11, 1999.)

Back in 1976, the Viking Orbiter sent back pictures of so-called "searchlight areas" in the northern hemisphere. The speculation then was that these glassy,
seemingly transparent features might be thin layers of ice. (AME5 in The Moon and the Planets)